[WFCORE-1618] Drop use of ProtocolChannelClient which is just an odd way to implement some factory methods Also standardize on ProtocolConnectionConfiguration instead of the ProtocolChannelClient.Configuration subclass which brings no added functionality

[WFCORE-1618] Clarify ManagementClientChannelStrategy use by not having ManagementChannelHandler create its own strategy It's helpful to know which classes are using ManagementClientChannelStrategy.Existing